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But, I would like to bring your attention to Y'shtola's lines after clearing the Hades trial. She mentioned how tattered the WoL's aether was from the rampaging Light that it was as though, the Darkness had completely eliminated it all. Hades is a 'true-human', who fought with his all against the 'one who wants to save the world', clashing all of his Darkness against them. In opposition, the WoL fought back with all the strength of the Light, vanquishing large amounts of it in the process. This was also conveyed in Hades' lines during the trial, and as well as after clearing it, in the cutscene where Light and Dark clashed at each other. As a result, perhaps the Light and Dark residing inside of WoL had reached an equilibrium? Meaning Emet-Selch had reached a certain conclusion..... So, I'd like you to take another look at those scenes, and perhaps you may reach a different interpretation. But of course, I can't quite say that this is THE answer.
It seems to me that WoL's aether reaching equilibrium wasn't purely a result of using it up in the battle, but rather Emet-Selch's doing as well, most likely intentionally. After all, even if WoL were to expend all the excess Light, that wouldn't really do anything to fix how badly your aether had been umbrally attuned - The innate corruption would still persist. The only thing that could counteract that and restore WoL to normality would be a similarly massive influx of Dark, astral aether. Y'shtola says as much in the cutscene after the battle, that Hades was the "dark to your light."